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The reason that swapping out the evaporator is that the air circulation box is a single unit. The damper flaps are inside the unit, of course, and not accessible.
You have a possibility of 3 problems:
The ECC temperature control for the passengerside is faulty. This is a pain to fix because the control board is directly behind the face, making removal of the temp selector difficult.
The damper motor works, but the damper is broken and falls down to the cold position. Others have reported that the plastic surrounding the metal rod that the damper is attached to has broken. Fixes have included glue and wire to keep the plastic from slipping. This will not generate an error code, but is a pain to fix. If you find this a problem, before removing the motor from the shaft, turn the passenger heat setting to cold so the motor is matched to the temperature/damper setting.
The temp sensor on the passenger side vent ducting is dead. Most unusual failure and should set a code in the ECC unit and cause the lights to blink.
The damper motor that you are concerned with faces the center console, and is the one that is closer to the firewall. Do NOT allow the damper motor to run while it is not engaged to the damper, it will self destruct and a dealer replacement is about $250 at the dealer.
Klaus
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Always willing to listen, just not able to take direction.
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